Method of casting cement or fibrocement under pressure



Jan. 8 1924. v 1,480,010

E. w. ROBERTS ET AL METHOD .OF CASTING CEMENT OR FIBROCEMENT UNDERPRESSURE Filed Jan. 6, 1922 2 Sheets-Sheet 1 Jan. 8,1924. 1,480,010

, E. w. ROBERTS ET AL...

METHOD OF CASTING CEMENT OR FIBROCEMENT UNDER PRESSURE Filed Jan. 6.1922 2 Sheets- Sheet 2 Patented Jan. '8, 1924.

OFFICE.

EDWARD WILLIAM ROBERTS, 0F WATFORD, AND LOUIS FREDK. WM. LEESE.

or LONDON, ENGLAND.

METHOD or cAs'rme CEMENT on EIBEocEMENT UNDER PRESSURE.

, Application filed January 6, 1922. Serial No. 527,293.

vented a certain new and useful Improvement in Methods of Casting Cementor Fibrocement under Pressure, of which the following is aspecification.

This invention-relates to an improved method of casting cement orfibro-cement under pressure adapted forhollow castings.

cement or fibre-cement mixture.

The improved method consists in introducing int-o the'casing or mouldprovided with an extensible core or cores of the de-' sired form themixture of the cement-or fibro-cement containing liquid in excesstovthat which would produce a good setting mixture and then causing thecore or cores to be expanded so as to force out excess liquid and tocompress between the mould or casing and the core or cores the cement orfibro-cement mixture.

In the accompanying drawings is shown by way of example means suitablefor carrying the method into effect and examples of castings'which maybe formed by this method. Referring to the drawings, Fig. 1 is aperspective view showing diagrammatically a collapsible casing or mouldin open position for the introduction of a series of expansible coremembers also shown. Fig. 2 is a detail View of one end of the casing ormould in closed position. Fig. 3 is a-perspective view of one of theexpansible core members shown in Fig. 1. Fig. 4 is a detail view showingin section the casing and one expansible core member in position thereinwith the core member expanded and compressing the surroiirnding ig. 5 isa detail view in perspective of an expansible liner for use ashereinafter explained. Fig. 6 shows a form of casting in perspectivecapable of being made of the improved method, and by the apparatusillustrated. Fig. 7 is a perspective vlew of another form of castingwhich can be made by the im proved method of the present invention.

Referring to the drawings and particw larly to Figs. 1 and 2 a denotesthe casing or mould the top and sides of which are hinged or otherwisearranged so as to swing aside to permit the insertion of expansiblecores 6 V suitably; momntted on a carriage c, the core ends d in theform shown bein arranged to form when in position one si e wall of thecasing or mould, the other side wall 03 being formed with openingsadapted to be entered by the free ends 6 of the cores and to be held inupright osition by suitable means when the casing is Closed. Theseexpansible cores, as indicated in Figs. 3 and 4, comprise a rigidsupport f surroundedby a rubber or other envelope 9 between which andthe rigid support air maybe supplied under pressure through a pipe h. Inthe arrangement shown in Fig. 1 employing. a plurality of cores all ofthe pipes h areconnected to a common source of compressed air. Incarrying the method into effect the cores are brought into position inthe easingand the casing bolted down tight by means of bolts 2'. Thecasing is then filled with an easily flowing poor setting cement orfibro-cement mixture air is supplied by the pipes in to the spacesbetween the rigid core members and the flexible envelopes g whereby suchflexible envelopes are caused. to expand so as to mould under pressurethe cement or the fibro-cement mixture to the desired form. Channels areformed in the casing or mould through which the excess water may beexpelled, the completed casting or moulding then-containing only theamount of water requisite for a good setting cement. The channelsconsist of holes punched in the inner and outer mold members and areshown in the drawings by black dots in Fig 1. I

In order to permit of easy and speedy removal of the casting or mouldingfrom the casing ormould without liability of damage to the casting wepreferably provide around the exterior of the expansible envelope g a.V/

C msnpw core member said core member consisting of 1 a rigid SUPPOIL andan expansible envs10%s e surrounding said support and adapted tosupplied with air under pressure, and a, liner said liner includingozverlappin lengths of sheet metal or the like shape to correspond withthe internal form of the casting to has produced substantially as and.for the i purpose set fonth.

In testimony whereof We'have signed our names to this specificatlon inthe presenns of two subscribing Witnesses.

EDWARD WELLIAM ROBERTS. LOUIS FREDK. WM. LEESE.

Witnssses HAROLD 1F AIMRATHEB, 1E. WREN.

